Rare earth ion effects on the pseudo-gap in electron-doped superconductors and possible nodeless d-wave gap

S. R. Park; C. S. Leem; Y. S. Roh; K. J. Choi; J. H. Kim; B. J. Kim; H. Koh; H. Eisaki; D. H. Lu; Z. X. Shen; N. P. Armitage; C. Kim

doi:10.1016/j.jpcs.2008.06.116

Rare earth ion effects on the pseudo-gap in electron-doped superconductors and possible nodeless d-wave gap

S. R. Park, C. S. Leem, Y. S. Roh, K. J. Choi, J. H. Kim, B. J. Kim, H. Koh, H. Eisaki, D. H. Lu, Z. X. Shen, N. P. Armitage, C. Kim

Department of Physics

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5 Citations (Scopus)

Abstract

We report angle resolved photoemission (ARPES) studies on electron-doped cuprate superconductor Sm_{2 - x} Ce_x CuO₄ (x = 0.14 and 0.18). A wide energy range scan shows clear "waterfall" effect at an energy scale close to 500 meV which is consistent with the value found in Nd_{2 - x} Ce_x CuO₄ (NCCO) but larger than that from hole-doped superconductors. High resolution results from both dopings show pseudo-gap effects that were observed in NCCO. However, the effects are found to be stronger than that observed in optimally doped NCCO. The overall electronic structure is well understood within a simple model in which a sqrt(2) × sqrt(2) static order is assumed. Both ARPES and optical measurements give the coupling strengths to the Q=(π / 2, π / 2) (due to the sqrt(2) × sqrt(2) order) to be about 0.1 eV, compatible with each other. The effect is strong enough to push the band near the nodal region below the Fermi energy, resulting in possible nodeless d-wave superconductivity where zero energy quasi-particle excitation is inhibited.

Original language	English
Pages (from-to)	2939-2943
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	69
Issue number	12
DOIs	https://doi.org/10.1016/j.jpcs.2008.06.116
Publication status	Published - 2008 Dec

Bibliographical note

Funding Information:
This work is supported by the KICOS in K20602000008 and by KOSEF (R01-2006-000-10904-0). ALS and SSRL are operated by the DOE Office of Basic Energy Sciences.

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1016/j.jpcs.2008.06.116

Cite this

@article{566177ef45dc4cf5be7b75224a7b4e71,

title = "Rare earth ion effects on the pseudo-gap in electron-doped superconductors and possible nodeless d-wave gap",

abstract = "We report angle resolved photoemission (ARPES) studies on electron-doped cuprate superconductor Sm2 - x Cex CuO4 (x = 0.14 and 0.18). A wide energy range scan shows clear {"}waterfall{"} effect at an energy scale close to 500 meV which is consistent with the value found in Nd2 - x Cex CuO4 (NCCO) but larger than that from hole-doped superconductors. High resolution results from both dopings show pseudo-gap effects that were observed in NCCO. However, the effects are found to be stronger than that observed in optimally doped NCCO. The overall electronic structure is well understood within a simple model in which a sqrt(2) × sqrt(2) static order is assumed. Both ARPES and optical measurements give the coupling strengths to the Q=(π / 2, π / 2) (due to the sqrt(2) × sqrt(2) order) to be about 0.1 eV, compatible with each other. The effect is strong enough to push the band near the nodal region below the Fermi energy, resulting in possible nodeless d-wave superconductivity where zero energy quasi-particle excitation is inhibited.",

author = "Park, {S. R.} and Leem, {C. S.} and Roh, {Y. S.} and Choi, {K. J.} and Kim, {J. H.} and Kim, {B. J.} and H. Koh and H. Eisaki and Lu, {D. H.} and Shen, {Z. X.} and Armitage, {N. P.} and C. Kim",

note = "Funding Information: This work is supported by the KICOS in K20602000008 and by KOSEF (R01-2006-000-10904-0). ALS and SSRL are operated by the DOE Office of Basic Energy Sciences. ",

year = "2008",

month = dec,

doi = "10.1016/j.jpcs.2008.06.116",

language = "English",

volume = "69",

pages = "2939--2943",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

publisher = "Elsevier Limited",

number = "12",

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TY - JOUR

T1 - Rare earth ion effects on the pseudo-gap in electron-doped superconductors and possible nodeless d-wave gap

AU - Park, S. R.

AU - Leem, C. S.

AU - Roh, Y. S.

AU - Choi, K. J.

AU - Kim, J. H.

AU - Kim, B. J.

AU - Koh, H.

AU - Eisaki, H.

AU - Lu, D. H.

AU - Shen, Z. X.

AU - Armitage, N. P.

AU - Kim, C.

N1 - Funding Information: This work is supported by the KICOS in K20602000008 and by KOSEF (R01-2006-000-10904-0). ALS and SSRL are operated by the DOE Office of Basic Energy Sciences.

PY - 2008/12

Y1 - 2008/12

N2 - We report angle resolved photoemission (ARPES) studies on electron-doped cuprate superconductor Sm2 - x Cex CuO4 (x = 0.14 and 0.18). A wide energy range scan shows clear "waterfall" effect at an energy scale close to 500 meV which is consistent with the value found in Nd2 - x Cex CuO4 (NCCO) but larger than that from hole-doped superconductors. High resolution results from both dopings show pseudo-gap effects that were observed in NCCO. However, the effects are found to be stronger than that observed in optimally doped NCCO. The overall electronic structure is well understood within a simple model in which a sqrt(2) × sqrt(2) static order is assumed. Both ARPES and optical measurements give the coupling strengths to the Q=(π / 2, π / 2) (due to the sqrt(2) × sqrt(2) order) to be about 0.1 eV, compatible with each other. The effect is strong enough to push the band near the nodal region below the Fermi energy, resulting in possible nodeless d-wave superconductivity where zero energy quasi-particle excitation is inhibited.

AB - We report angle resolved photoemission (ARPES) studies on electron-doped cuprate superconductor Sm2 - x Cex CuO4 (x = 0.14 and 0.18). A wide energy range scan shows clear "waterfall" effect at an energy scale close to 500 meV which is consistent with the value found in Nd2 - x Cex CuO4 (NCCO) but larger than that from hole-doped superconductors. High resolution results from both dopings show pseudo-gap effects that were observed in NCCO. However, the effects are found to be stronger than that observed in optimally doped NCCO. The overall electronic structure is well understood within a simple model in which a sqrt(2) × sqrt(2) static order is assumed. Both ARPES and optical measurements give the coupling strengths to the Q=(π / 2, π / 2) (due to the sqrt(2) × sqrt(2) order) to be about 0.1 eV, compatible with each other. The effect is strong enough to push the band near the nodal region below the Fermi energy, resulting in possible nodeless d-wave superconductivity where zero energy quasi-particle excitation is inhibited.

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JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 12

ER -

Rare earth ion effects on the pseudo-gap in electron-doped superconductors and possible nodeless d-wave gap

Abstract

Bibliographical note

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